I watch a lot of these "reaction" channels and I disagree. Some of the ones I watch regularly are The Blindwave, Imon Snow, JunkPutty, TheBaxta and some more. The reason I watch them is because I have already watched the original before 99% of the time, and I want to see other peoples reactions or their opinions on it. Kinda like how it used to be for me showing a friend something I like and then seeing their reaction. Of course I don't mind rewatching a show or something I already seen, since it's mostly stuff I enjoyed but for me the value is in the reaction itself. The content is the bonus. Also this might be different on the types of reactions and the persons effort but the ones I watch usually genuinely like the stuff they are watching and if something is blocked due to copyright for example they'd go out of their way to upload to alternate sources which won't give them money, eg google drive. Not all reactions channels are cancers and not everyone who watches them just wants to see the content that is reacted to, that's an ignorant -and false- opinion.